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Engines operated by means of hot air, called caloric engines, and engines operated by gas, or explosive substances, all act substantially upon the same general principles as steam-engines; the greatest distinction being between those engines wherein the generation of heat is by the combustion of fuel, and those wherein heat and expansion are produced by chemical action. With the exception of a limited number of caloric or air engines, steam machinery comprises nearly all expansive engines that are employed at this day for motive-power; and it may be safely assumed that a person who has mastered the general principles of steam-engines will find no trouble in analysing and understanding any machinery acting from expansion due to heat, whether air, gas, or explosive agents be employed.

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For pulleys, gear wheels, or other standard parts of machinery which are not likely to be modified or changed, iron patterns are preferable; patterns for gear wheels and pulleys, when made of wood, aside from their liability to spring and warp, cannot be made sufficiently strong to withstand foundry use; besides, the greatest accuracy that can be attained, even by metal patterns, is far from producing true castings, especially for tooth wheels. The more perfect patterns are, the less rapping is required in drawing them; and the less rapping done, the more perfect castings will be."I'll dress at once," she said. "My bedroom door is locked, so this is the only way I can escape. Get out something dark for me to wear, Hannah."

ONE:By assuming this or any other well-proved example, and estimating larger or smaller shafts by keeping their diameters as the cube root of the power to be transmitted, the distance between bearings as the diameter, and the speed inverse as the diameter, the reader will find his calculations to agree approximately with the modern practice of our best engineers. This is not mentioned to give proportions for shafts, so much as to call attention to accidental strains, such as winding belts, and to call attention to a marked discrepancy between actual practice and such proportions as would be given by what has been called the measured or determinable strains to which shafts are subjected.��Steady, all! Engine��s quit and left us with a dead stick! No danger.�� TWO:Never thinking of rest he went on day and night, taking away the poor fellows' arms and legs, and all this by the miserable light of some candles. Gas and electricity were not to be had, the works being idle after the destruction of the town....My "foreign" passport was, of course, in French, of which language the man evidently knew not a word. Although I explained that this passport was the best one could get in The Netherlands, that I had paid six guilders and seventy-five cents for it, that I was a war-correspondent of De Tijd, it was all useless. I had to go with him to the guard-house, and the man kept the queer passport��the damning piece of evidence��firmly in his hand. All the inquisitive loafers, of which the frontier was full during those days, followed me, and so we went in procession to the guard-house, at some distance from the frontier. I heard all sorts of discussions behind me, and constantly caught words like: German, boche, deserter, franc-tireur, spy, and other complimentary niceties.

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ONE:II.

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THREE:To their startled ears came a muffled clang, a queer, hollow sound��and as they turned to run back under the rolled-up door, it slid rapidly down in its grooves, dropping into place with a hollow rumble.